title: F. C. C. rules for diathermy equipment manufactured prior to July 1, 1947: postponement of effective date of compliance.
mesh_terms: D003132:Commerce; D003972:Diathermy / Q000295:instrumentation*; D006801:Humans; D006979:Hyperthermia, Induced; D013525:Surgical Instruments
keywords: DIATHERMY/apparatus and instruments